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driver-core: fix race between device_register and driver_register

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When a device is registered to a bus it will be a) added to the list
of devices of the bus and b) bind to a driver (if one matches). As a
result of a driver being registered at this bus between a) and b) this
device could already be bound to a driver. This leads to a warning
and incorrect refcounting.
To fix this add a check to device_attach to identify an already bound
device.

Signed-off-by: Sebastian Ott <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Sebastian Ott 2011-04-12 19:05:37 +02:00 • committed by Greg Kroah-Hartman
commit 8497d6a21c
1 changed files with 5 additions and 0 deletions
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5
drivers/base/dd.c
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@ -245,6 +245,10 @@ int device_attach(struct device *dev)
device_lock(dev);
if (dev->driver) {
if (klist_node_attached(&dev->p->knode_driver)) {
ret = 1;
goto out_unlock;
}
ret = device_bind_driver(dev);
if (ret == 0)
ret = 1;
@ -257,6 +261,7 @@ int device_attach(struct device *dev)
ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach);
pm_runtime_put_sync(dev);
}
out_unlock:
device_unlock(dev);
return ret;
}